Capacity Assessment Update for the 60,000 EP Orange STP (MLE) for Orange City Council (NSW).

Orange STP is a 40,000 EP facility that services the majority of the city of Orange in NSW. ASpect undertook a capacity assessment of Orange STP in 2008. Orange City Council asked ASpect to update this capacity assessment based on changes to the plant and the operating regime since 2008. These changes were in response to ASpect’s recommendations in the 2008 capacity assessment and 2010 performance assessment and included the decommissioning of trickling filters, improvements to chlorinated disinfection, bulking mitigation measures and an upgrade to the dissolved air flotation facility. ASpect concluded that the capacity improvements were in line with the predictions made in 2008 and were equivalent to around 20 years of growth in the catchment. Remaining bottenecks were identified with both capital and non-capital improvements recommended.